6XXX ALUMINUM ALLOY FOR EXTRUSION WITH EXCELLENT CRASH PERFORMANCE AND HIGH YIELD STRENGTH AND METHOD OF PRODUCTION THEREOF

摘要

The invention relates to an extruded product made of 6xxx a!uminium alloy comprising 0.40 - 0.80 wt % Si, 0.40 - 0.80 wt. % Wig, 0.40 - 0.70 wt. % Cu, up to 0.4 wt. % Fe, up to 0.30 wt. % Mn, up to 0.2 wt. % Cr, up to 0.2 wt. % V, up to 0.14 wt. % Zr, up to 0.1 wt. % Ti, up to 0.05 wt. % each impurity and total 0.15 wt. %, remainder aluminum, wherein the ratio Mg/Sifree is between 0.8 and 1.2 where Si free is calculated according to the equation Si free = Si - 0.3*(Mn+Fe) where Si, Win and Fe correspond to the content in weight % of Si, Win and Fe of said 6xxx aluminum alloy and to the corresponding extruded product particularly suitable with a tensile yield strength higher than 280 MPa, and excellent crash properties. The invention also relates to the manufacturing process to obtain such extruded product.